I want to build a Facebook game that's similar to Mafia Wars as in:
mainly text based
users accomplish tasks to gain money, exp points
users have to purchase items to accomplish certain tasks
users gain xp to level up to attempt more complex tasks

sample task in mafia wars: open a casino: requires $50k, 50 slot machines, 10 cars

This game won't be as complex as mafia wars, but I'm looking for a similar gameplay functionality.

Will require design and graphics.